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D( x )
x = 0
0.6-x = 0
x = 0
x = 0
0.6-x = 0
0.6-x = 0
0.6-x = 0 // - 0.6
-x = -0.6 // * -1
x = 0.6
x in (-oo:0) U (0:0.6) U (0.6:+oo)
1/x = 2/(0.6-x) // - 2/(0.6-x)
1/x-(2/(0.6-x)) = 0
1/x-2*(0.6-x)^-1 = 0
1/x-2/(0.6-x) = 0
(-2*x)/(x*(0.6-x))+(1*(0.6-x))/(x*(0.6-x)) = 0
1*(0.6-x)-2*x = 0
0.6-3*x = 0
(0.6-3*x)/(x*(0.6-x)) = 0
(0.6-3*x)/(x*(0.6-x)) = 0 // * x*(0.6-x)
0.6-3*x = 0
0.6-3*x = 0 // - 0.6
-3*x = -0.6 // : -3
x = -0.6/(-3)
x = 0.2
x = 0.2
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